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arXiv 1202.5592hep-phhep-ex
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在NLO QCD中的LHC处与顶夸克有关的单slepton产生

Single slepton production associated with a top quark at LHC in NLO QCD

Li Xiao-Peng, Guo Lei, Ma Wen-Gan, Han Liang, Zhang Ren-You, Wang Shao-Ming

摘要:

在CERN大型强子对撞机(LHC)上,顶夸克伴随的单slepton产生是研究R宇称破坏耦合的重要过程之一。本文计算了LHC上QCD次主导阶(NLO)对$pp \to t\slep^{-}(\bar{t}\slep^{+})+X$过程的修正,并讨论了QCD修正对运动学分布的影响。我们研究了首阶和非线性光学QCD修正积分截面对因子化/重整化能量标度、slepton、停夸克和胶子质量的依赖关系。我们发现,非线性光学QCD修正明显改善了由能量标度引起的LO截面的不确定性,并且排他喷注事件选择方案比包容方案更好地保持了微扰级数的收敛性.结果表明,非线性光学QCD修正可以降低顶夸克的极化不对称性,且随着$\tilde{t}_1$或$\tilde{g}$质量的增加,QCD修正量一般增加.

英文摘要:

Single slepton production in association with a top quark at the CERN Large Hadron Collider (LHC) is one of the important processes in probing the R-parity violation couplings. We calculate the QCD next-to-leading order (NLO) corrections to the $pp \to t\slep^{-}(\bar{t}\slep^{+})+X$ process at the LHC and discuss the impacts of the QCD corrections on kinematic distributions. We investigate the dependence of the leading order (LO) and the NLO QCD corrected integrated cross section on the factorization/renormalization energy scale, slepton, stop-quark and gluino masses. We find that the uncertainty of the LO cross section due to the energy scale is obviously improved by the NLO QCD corrections, and the exclusive jet event selection scheme keeps the convergence of the perturbative series better than the inclusive scheme. The results show that the polarization asymmetry of the top-quark will be reduced by the NLO QCD corrections, and the QCD corrections generally increase with the increment of the $\tilde{t}_1$ or $\tilde{g}$ mass value.

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